This have never happened to me before, any suggestions?

Anonymous
So long story short, i was a pretty close friend with a girl for 3 years, she's being really kind and care about the stuffs in my life, she's not the party girl type as well so really good in my opinion. We’re in the same school so we see each other quite a lot for the last year. But this year she's dont do the same courses anymore.
she's 18 and im currently 15 (i was 12 when i met her), at the end of the last year i noticed that I’m starting to develop feelings for her but i kept silent, but since she's not in the same class anymore i dont see her often (havnt seem her for the past 2 months). But the thing is that she's not even texting me anymore, she used to text me all the time even we aren’t seeing each other. Now i really miss her.
She told me she got her first boyfriend a few weeks back, and she’s complaining a lot about how her boyfriend treats her badly and he's a jerk (how surprising, he's really rich and has above average look)
Anyways, should i tell her how i feel? If yes, how? If no, how i move on?
Should i tell my buddy about it?
This have never happened to me before, any suggestions?
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